Keener earned Oscar nominations for Being John Malkovich and Capote.
The site had no further information on the news, like who Keener might play.
They will appear in the sequel alongside returning stars Joaquin Phoenix and Zazi Beetz.
2019’s Joker was a huge success, bringing inmore than $1 billion at the box office.
Phoenix earned an Oscar for his portrayal of the title character.
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